Sequence is {a(7,n)}, where a(m,n) is defined in sequence A110665.

Terms

a(0) =0a(1) =1a(2) =7a(3) =25a(4) =59a(5) =98a(6) =104a(7) =7a(8) =-293a(9) =-926a(10) =-2064a(11) =-3945a(12) =-6897a(13) =-11349a(14) =-17829a(15) =-26964a(16) =-39498a(17) =-56328a(18) =-78540a(19) =-107426a(20) =-144482a(21) =-191408a(22) =-250132a(23) =-322858a(24) =-412114a(25) =-520775a(26) =-652061a(27) =-809537a(28) =-997143a(29) =-1219254